WebB. Deuterostome. Animals with bilateral symmetry. a.) can be divided into similar halves by any plane through the longitudinal axis. b.) are relatively simple in structure. c.) are usually very slow-moving organisms. d.) are better adapted for directed forward movement than radially symmeterical organisms. D.
Geology exam 4 Flashcards Quizlet
WebThe chordates evolved during the period during the limbs era jaws During the period, both appeared and jawed fishes Ordovician Paleozoic The jawed fishes were the first of the … These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. See more A chordate is an animal of the phylum Chordata (/kɔːrˈdeɪtə/). All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them … See more The following schema is from the 2015 edition of Vertebrate Palaeontology. The invertebrate chordate classes are from Fishes of the World. While it is structured so as to reflect evolutionary relationships (similar to a cladogram), it also retains the traditional ranks … See more The closest relatives of the Chordates are the Hemichordates and Echinodermata, which together form the Ambulacraria. The Chordata and Ambulacraria together form the superphylum See more Chordates form a phylum of animals that are defined by having at some stage in their lives all of the following anatomical features: • A notochord, a stiff rod of cartilage that extends along the inside of the body. Among the … See more Cephalochordata: Lancelets Cephalochordates, one of the three subdivisions of chordates, are small, "vaguely fish … See more Overview There is still much ongoing differential (DNA sequence based) comparison research that is … See more Although the name Chordata is attributed to William Bateson (1885), it was already in prevalent use by 1880. Ernst Haeckel described a taxon … See more scotland indiana history
Cambrian Period National Geographic - Science
WebCambrian period. marine algae flourish; first chordates appear. Ordovician period. nonvascular land plants appear on land; first jawless appear. Silurian period. seedless … WebMar 5, 2024 · At first, invertebrates developed tissues from just two embryonic cell layers. There was an outer cell layer called ectoderm and an inner cell layer called endoderm. … WebPrecambrian Era. formation of the one-celled organism, age of blue-green algae (Cyanobacteria) Precambrian Era. formation of the multi-celled organisms, green algae, … scotland independent tours